package com.cheksin.url;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpUtil {
    /**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param, Map<String, String> requestHeaderMap) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            if (requestHeaderMap != null) {
				for (Map.Entry<String, String> entry : requestHeaderMap
						.entrySet()) {
					String key = entry.getKey();
					String val = entry.getValue();
					if (key != null && val != null) {
						conn.setRequestProperty(key, val);
					}
				}
			}
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
            result = "{\"ret\":1,\"msg\":\"提交失败，稍后再试！\"}";
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
    
    
    /** 
     * 发送POST请求 
     *  
     * @param url 
     *            目的地址 
     * @param parameters 
     *            请求参数，Map类型。 
     * @return 远程响应结果 
     */  
    public static String sendPost(String url, Map<String, String> parameters) {  
        String result = "";// 返回的结果  
        BufferedReader in = null;// 读取响应输入流  
        PrintWriter out = null;  
        StringBuffer sb = new StringBuffer();// 处理请求参数  
        String params = "";// 编码之后的参数  
        try {  
            // 编码请求参数  
            if (parameters.size() == 1) {  
                for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
                                    "UTF-8"));  
                }  
                params = sb.toString();  
            } else {  
                for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
                                    "UTF-8")).append("&");  
                }  
                String temp_params = sb.toString();  
                params = temp_params.substring(0, temp_params.length() - 1);  
            }  
            // 创建URL对象  
            URL connURL = new URL(url);
            // 打开URL连接  
            HttpURLConnection httpConn = (HttpURLConnection) connURL
                    .openConnection();  
            // 设置通用属性  
            httpConn.setRequestProperty("Accept", "*/*");  
            httpConn.setRequestProperty("Connection", "Keep-Alive");  
            httpConn.setRequestProperty("User-Agent",  
                    "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
            // 设置POST方式  
            httpConn.setDoInput(true);  
            httpConn.setDoOutput(true);  
            // 获取HttpURLConnection对象对应的输出流  
            out = new PrintWriter(httpConn.getOutputStream());  
            // 发送请求参数  
            out.write(params);  
            // flush输出流的缓冲  
            out.flush();  
            // 定义BufferedReader输入流来读取URL的响应，设置编码方式  
            in = new BufferedReader(new InputStreamReader(httpConn  
                    .getInputStream(), "UTF-8"));  
            String line;  
            // 读取返回的内容  
            while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                if (out != null) {  
                    out.close();  
                }  
                if (in != null) {  
                    in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }  
        return result;  
    }
    
    
    public static String urlConnection(String url){
	HttpURLConnection conn = null;
        try {
            URL realUrl = new URL(url);
            conn = (HttpURLConnection) realUrl.openConnection();
            conn.setRequestMethod("GET");
            conn.setUseCaches(false);
            conn.setReadTimeout(8000);
            conn.setConnectTimeout(8000);
            conn.setInstanceFollowRedirects(false);
            conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0");
            int code = conn.getResponseCode();
            if (code == 200) {
                InputStream is = conn.getInputStream();
                BufferedReader in = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                StringBuilder buffer = new StringBuilder();
                String line = "";
                while ((line = in.readLine()) != null){
                    buffer.append(line);
                }
                return buffer.toString();
            }
        }catch (Exception e){
            System.err.println("获取数据失败！");
        }
        return "";
    }
    
    public static boolean sendPost200(String url, Map<String, String> parameters) {  
        BufferedReader in = null;// 读取响应输入流  
        PrintWriter out = null;  
        StringBuffer sb = new StringBuffer();// 处理请求参数  
        String params = "";// 编码之后的参数  
        try {  
            // 编码请求参数  
            if (parameters.size() == 1) {  
                for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
                                    "UTF-8"));  
                }  
                params = sb.toString();  
            } else {  
                for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
                                    "UTF-8")).append("&");  
                }  
                String temp_params = sb.toString();  
                params = temp_params.substring(0, temp_params.length() - 1);  
            }  
            // 创建URL对象  
            URL connURL = new URL(url);
            // 打开URL连接  
            HttpURLConnection httpConn = (HttpURLConnection) connURL
                    .openConnection();  
            // 设置通用属性  
            httpConn.setRequestProperty("Accept", "*/*");  
            httpConn.setRequestProperty("Connection", "Keep-Alive");  
            httpConn.setRequestProperty("User-Agent",  
                    "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
            // 设置POST方式  
            httpConn.setDoInput(true);  
            httpConn.setDoOutput(true);  
            // 获取HttpURLConnection对象对应的输出流  
            out = new PrintWriter(httpConn.getOutputStream());  
            // 发送请求参数  
            out.write(params);  
            // flush输出流的缓冲  
            out.flush();  
            if(httpConn.getResponseCode() == 200){
            	return true;
            }
            return false;
            
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                if (out != null) {  
                    out.close();  
                }  
                if (in != null) {  
                    in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }  
        return false;  
    }
}